I am not certain as to your question, but I am reminded that Pickering made a turntable in the Sixties suspending the turntable with a pair of circular magnets. I had one and it worked OK.
In order to float a heavy plinth, the magnets must be able to generate a very strong magnetic field. Cart is very sensitive to magnetic field. Unless your cart is well shielded, given the close proximity to strong magnetic field, the result could be disastrous.
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